龜鱉目 (Testudines) is an order of reptiles that includes turtles, tortoises, and terrapins. These animals are characterized by their bony or cartilaginous shell, which protects them from predators. They are found in a variety of habitats, including oceans, rivers, and land. 龜鱉目 are ectothermic, meaning they rely on external sources to regulate their body temperature. They have a unique anatomy, with a beak instead of teeth and a distinctive shell structure. Many species are known for their longevity and slow growth rates, making them fascinating subjects for study in conservation and ecology.